local pluginKey = "bts/metrics"

local sprite = app.sprite

local name = app.fs.fileTitle(sprite.filename)

local previousExportFilename = sprite.properties(pluginKey).previousExportFilename

if previousExportFilename == nil then
	local defaultPath = app.fs.filePath(sprite.filename)
	local defaultFilename = name..".lua"
	previousExportFilename = app.fs.joinPath(defaultPath, defaultFilename)
end

local dlg = Dialog()
dlg:file{ id="metrics_filename", label="Metrics output:", filename=previousExportFilename, filetypes=".lua", save=true }
dlg:button{ id="confirm", text="Confirm" }
dlg:button{ id="cancel", text="Cancel" }
dlg:show()

local data = dlg.data
if data.confirm then
	name = app.fs.fileTitle(data.metrics_filename)

	local basePath = app.fs.filePath(data.metrics_filename)
	local imagePath = app.fs.joinPath(basePath, name)

	local layerLookup = {}
	local originalLayerVisible = {}
	
	for i, layer in ipairs(sprite.layers) do
		if layer.parent == layer.sprite then
			originalLayerVisible[layer.name] = layer.isVisible
			layer.isVisible = false
			
			layerLookup[layer.name] = layer
		end
	end
	
	local imageDetails = {}
	
	for i, slice in ipairs(sprite.slices) do
		local id = slice.name
	
		if layerLookup[id] then
			local layer = layerLookup[id]
			local filename = app.fs.joinPath(imagePath, id..".png")
	
			layer.isVisible = true
			app.command.SaveFileCopyAs{ ui=false, filename=filename, slice=id }
			layer.isVisible = false
	
			table.insert(imageDetails, id)
		end
	end
	
	local metricsDetails = {}
	
	for i, slice in ipairs(sprite.slices) do
		local id = slice.name
		local sliceMetrics = {}
	
		sliceMetrics["origin"] = { slice.bounds.x, slice.bounds.y}
		sliceMetrics["size"] = { slice.bounds.width, slice.bounds.height}
		sliceMetrics["center"] = { (slice.bounds.x + slice.bounds.width / 2), (slice.bounds.y + slice.bounds.height / 2)}
	
		metricsDetails[id] = sliceMetrics
	end
	
	--[[if false then
		local metricsFilename = app.fs.joinPath(metricsPath, name..".ui.metrics.json")
		local metricsFile = io.open(metricsFilename, "w")
		local metricsJson = json.encode(metricsDetails)
		metricsFile:write(metricsJson)
		io.close(metricsFile)
	end]]
	
	if true then
		--local metricsFilename = app.fs.joinPath(metricsPath, data.metrics_filename)
		local metricsFile = io.open(data.metrics_filename, "w")
	
		metricsFile:write(name.."ImagesTable = {\n")
		for k,v in ipairs(imageDetails) do
			metricsFile:write("\t\"" .. v .. "\",\n")
		end
		metricsFile:write("}\n")
		metricsFile:write("\n")
	
		metricsFile:write(name.."MetricsTable = {\n")
		for k,v in pairs(metricsDetails) do
			metricsFile:write("\n")
			metricsFile:write("\t[\"" .. k .. ".origin\"] = { x=" .. v["origin"][1] .. ", y=" .. v["origin"][2] .. " },\n")
			metricsFile:write("\t[\"" .. k .. ".size\"] = { w=" .. v["size"][1] .. ", h=" .. v["size"][2] .. " },\n")
			metricsFile:write("\t[\"" .. k .. ".center\"] = { x=" .. v["center"][1] .. ", y=" .. v["center"][2] .. " },\n")
		end
		metricsFile:write("\n")
		metricsFile:write("}\n")
		metricsFile:write("\n")
		metricsFile:write("registerMetrics(\""..name.."\", "..name.."ImagesTable, "..name.."MetricsTable)\n")
	
		io.close(metricsFile)
	end
	
	for k, v in pairs(originalLayerVisible) do
		local layer = layerLookup[k]
		layer.isVisible = v
	end

	sprite.properties(pluginKey).previousExportFilename = data.metrics_filename
end